When air resistance can be neglected, an object which falls from rest for three seconds will fall a distance of

(A) 15m. (B) 30m. (C) 45m. (D) 90m.

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21.5

When air resistance can be neglected, an object which falls from rest for three seconds will fall a distance of

(A) 15m. --- No.
The distance depends on t
-- t multiplied by itself.

Try again.

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21.5

When air resistance can be neglected, an object which falls from rest for three seconds will fall a distance of

(B) 30m. --- No.

Use d = (1/2)at.

Try again.

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21.5

When air resistance can be neglected, an object which falls from rest for three seconds will fall a distance of

(C) 45m. --- Yes.

d = (1/2)(10m/s)(3s) = (1/2)(10)(3)(3)m.

Check the other answers.

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21.5

When air resistance can be neglected, an object which falls from rest for three seconds will fall a distance of

(D) 90m. --- No.

No. Don't forget the (1/2) in the formula.

Try again.

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21.5